Repo created

TMessagesProj/jni/voip/webrtc/base/files/scoped_file.cc

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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/files/scoped_file.h"
+
+#include "base/logging.h"
+#include "build/build_config.h"
+
+#if defined(OS_POSIX) || defined(OS_FUCHSIA)
+#include <errno.h>
+#include <unistd.h>
+
+#include "base/posix/eintr_wrapper.h"
+#endif
+
+namespace base {
+namespace internal {
+
+#if defined(OS_POSIX) || defined(OS_FUCHSIA)
+
+// static
+void ScopedFDCloseTraits::Free(int fd) {
+  // It's important to crash here.
+  // There are security implications to not closing a file descriptor
+  // properly. As file descriptors are "capabilities", keeping them open
+  // would make the current process keep access to a resource. Much of
+  // Chrome relies on being able to "drop" such access.
+  // It's especially problematic on Linux with the setuid sandbox, where
+  // a single open directory would bypass the entire security model.
+  int ret = IGNORE_EINTR(close(fd));
+
+#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_FUCHSIA) || \
+    defined(OS_ANDROID)
+  // NB: Some file descriptors can return errors from close() e.g. network
+  // filesystems such as NFS and Linux input devices. On Linux, macOS, and
+  // Fuchsia's POSIX layer, errors from close other than EBADF do not indicate
+  // failure to actually close the fd.
+  if (ret != 0 && errno != EBADF)
+    ret = 0;
+#endif
+
+  PCHECK(0 == ret);
+}
+
+#endif  // OS_POSIX || OS_FUCHSIA
+
+}  // namespace internal
+}  // namespace base